“We received reports of [an] active shooter on Academy grounds,” tweeted the USAFA, whose Preparatory School discovered racial slurs had been written on several African-American cadets’ message boards earlier this week.

“There are no confirmation of shots fired. Security forces are sweeping the area,” it added.

EPSO and military personnel investigating shots fired on the Air Force Academy . Nothing is confirmed yet. More info will be forthcoming. pic.twitter.com/cMBuACfxUY